Structure Encyclopedia

Structure Encyclopedia turns structure visits into encyclopedia pages — lore, description, mobs, and notable loot — in a book-style GUI. Pages start locked (???). Stand inside a listed structure to unlock it, then open the book anytime with K or the craftable item (Book + Compass + Amethyst Shard).

Vanilla coverage ships in the jar. Datapacks and other mods can add or replace entries with JSON under data/<namespace>/structure_encyclopedia/ — no Java required.